Production of fertilizer salts



Patented May 16, 1933 ,UNITED STATES ms'r unnncxn. or nmnnmnne, emamr,assrexon. so I. e. rmmmmns'rarn or ranwxroar-on-mnm, annex! AKTIINGPATENT orncs- PRODUCTION OI FERTILIZER SALTS Io Drawing. Applicationfled January 8, 1980, Serial Ilo. l18 ,488,and in Germany February S1,1089.

esses which are convenient to carry out in practice, is an excellentinitial material for the manufacture and production of fertilizer salts,containing (potash and nitrolgen or potash, nitrogen an phosphorus. heprocess according to the present invention is carried out by treatingthe carbamate, either as such 3 corresponding neutral salts may or inadmixture, for example with other compounds containing nitrogen or withphosphates, preferably in the a sence of substantial amounts of water,with a suitable quantity of an acid preferably nitric acid or phosphoricacid. The corresponding acid salts may be employed instead of orpreferably in addition to theacids. The V also be added to the acids. Itis thus possible to valuable mixed ferobtain directly ve f ertilizers ofany desired tilizers or complete composition by the suitable choice ofthe acids or salts and by employing suitable proportions. Any free acidor acidin the form of acid salts in the final product obtained may beremoved or neutrahzed by treatment with agents having a basic action,such as ammonia. In particular primary ammo nium phosphate may forexample be converted into secondary ammonium phosphate.

The process according to the present in-' vention may be carried out forexample by introducing the solid carbamate into the acid, preferablywhile stirring. The conversion for example with concentrated nitric acidproceeds in such a manner that a d mixture of e uimolecularquantities'of O, and NEN is formed with the evolution of carbon dioxide.When phosphoric acid is present at the same time a double decompositionof the potassium phosphate formed and the ammonium nitrate takes placeso that by the employment of suitable proportions it is possibledirectly to obtain t e mixture:

Preferably the quantit of acid should be so large as to ensure t at acomplete conversion of the carbamate takes place. It it frequentlypreferable to add other compounds containing nitro n, as for exampleurea, or other compoun containing phosphorus addition to nitric and/orphosphone acid or both in order to obtain products with the usualnutrient proportions of K:N :P, for example products containing N P 0,and K 0 m t e proportion of 1: 0&5 to 2:1 to 1.75. Acid salts, such asKH,(PO may also be added.

The following examples will further illustrate the nature of thisinvention, but the invention is not restricted to these examples. Theparts are by weight.

Example 1 198 parts of potassium carbamate are dewith a mixture of 196parts of com sulphuric acid and 264 parts of ammonium composed with amixture of 98 parts ofphosphoric acid and 63 parts of nitric acid. Aproduct containin 13 per cent of N, 32.5 r .cent of P,O, an 21.5 percent of 1L0 is obtained with the evolution of dioxide.

' Example 8 .Gaseous ammonia is led through-the not obtained accordingto Example product is thus obtained which contains 18 per cent of N,30.5 per cent of P 0, and 20 per cent of K 0.

5 Example 4 198 parts of potassium carbamate are decomposed with amixture of 98 parts of phosphoric acid, 126 parts of nitric acid and 40parts of ammonium nitrate. The prodnot obtained has a content of 19.2per cent of N, 18.4 per cent of P 0 and 25.2 per cent of K 0.

What I claim is 1. The process of producing fertilizer salts whichcomprises decomposing solid potassium carbamate with an inorganic acidnon-injurious to plants.

2. The process of producing fertilizer salts which comprises decomposingsolid potassium carbamate-with an inorganic acid and an inorganic acidsalt non-injurious to plants.

3. The process of producing fertilizer salts which comprises decomposingsolid p0- tassium carbamate with an acid selected from the groupconsisting of nitric acid and phosphoric acid.

4. The process of producing fertilizer salts which comprises decomposingsolid potassium carbamate with phosphoric acid.

5. The process of producing fertilizer salts which comprises decomposingsolid potassium carbamate with phosporic acid and at least partlyneutralizing the resulting product.

6. The process of producing fertilizer salts I which comprisesdecomposing solid otassium carbonate with phosphoric acl and at leastpartly neutralizing the resulting product with ammonia.

7. The process of producing a fertilizing mixture which comprisesdecomposing soli potassium carbamate with an acid inorganic compoundhaving a strong m neral acid anion and containing in combined form aplant nutrient selected from the class consistin of N, K and P.

8. The process of roducing fertilizing salts which comprises ecomposmgsolid potasslium carbamate with a strong mineral 9. The process ofproducing fertilizer salts which comprises decomposing solid p0 tassiumcarbamate with a strong mineral 1 acid and a salt of a strong mineralacid containing in combined form a plant nutrient selected from theclass consisting of N, K and P.

10. The process of producing fertilizer salts which comprisesdecomposing solid potassium carbamatewith phosphoric acid and nitricacid. In testimony whereof I have hereunto set my hand. o5 ERNSTJAENECKE.

